Mr Dirceu was former President Luiz Inacio Lula da Silva's chief of staff between 2003 and 2005 and has been sentenced to more than 10 years in jail.

Mr Genoino, a former head of president Lula's Workers Party (PT), was sentenced to nearly seven years in jail, but was allowed to begin his new mandate as a member of Congress. He plans to appeal against the sentence.

The hacker criticised other legislators for applauding Mr Genoino's inauguration last week and called for protests.

Delubio Soares was PT's treasurer and has been given a jail sentence of eight years and 11 months.

'Time for action'

"Brazil has experienced one of the most embarrassing moments in its history," the hacker wrote.

"It's time for some action, don't you think, citizens?"

Image caption
Jose Dirceu (right), seen here with ex-President Lula, was one of those convicted as part of the trial

The Brazilian hacker also divulged personal data of businessman Carlos Augusto Ramos, better known as Carlinhos Cachoeira, sentenced in a separate case to 39 years in jail but released before the New Year after having served only five days.

On Twitter, nbdu1nder promised to reveal more data about convicted politicians.

The "Mensalao" scandal, which erupted in 2005, for a time threatened to engulf the Lula administration but he was comfortably re-elected as president the following year.

Lula himself was not implicated in the case and has denied any knowledge of the scheme. He left office at the end of 2010 with huge approval ratings, and remains a popular figure in Brazilian political life.

The trial, which became known as the "Mensalao" or the "Big Monthly" allowance, was seen as a key test of Brazil's ability to hold its politicians to account for corruption.